Controllable synthesis and optical characterizations of ZnO nanostructures by citric acid-assisted annealing process

摘要

By citric acid-assisted annealing process, ZnO nanostructures, including nanorods with diameters ranging from 25 to 88 nm and with length up to I gm and polygonal granules with diameters between 200 and 500 nm, were obtained. Morphologies of the ZnO nanostructures were controlled by calcine temperature. The samples were characterized by X-ray diffraction, field-emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HRTEM), FTIR spectrophotometer and ultraviolet-visible (UV-vis) spectroscopy. The influence of annealing temperature and time on the synthesis of ZnO nanostructures was investigated. This work presented a simple and effective route for the controllable syntheses of oxide nanostructures. (C) 2007 Elsevier B.V. All rights reserved.